321442321 has 4 divisors (see below), whose sum is σ = 321545700. Its totient is φ = 321338944.

The previous prime is 321442309. The next prime is 321442343. The reversal of 321442321 is 123244123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123244123 = 2069 ⋅59567.

It can be written as a sum of positive squares in 2 ways, for example, as 67486225 + 253956096 = 8215^2 + 15936^2 .

It is a cyclic number.

It is not a de Polignac number, because 321442321 - 2¹⁹ = 320918033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 321442292 and 321442301.

It is not an unprimeable number, because it can be changed into a prime (321442301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46876 + ... + 53293.

It is an arithmetic number, because the mean of its divisors is an integer number (80386425).

Almost surely, 2^321442321 is an apocalyptic number.

It is an amenable number.

321442321 is a deficient number, since it is larger than the sum of its proper divisors (103379).

321442321 is a wasteful number, since it uses less digits than its factorization.

321442321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103378.

The product of its digits is 1152, while the sum is 22.

The square root of 321442321 is about 17928.8125931418. The cubic root of 321442321 is about 685.0164778390.

Adding to 321442321 its reverse (123244123), we get a palindrome (444686444).

The spelling of 321442321 in words is "three hundred twenty-one million, four hundred forty-two thousand, three hundred twenty-one".